禁用从站点包读取

Question

$ cd python_test_venv/
$ python3.6 -m venv env
$ . env/bin/activate
$ which pip
~/python_test_venv/env/bin/pip
$ pip -V
pip 9.0.1 from [...]/python_test_venv/env/lib64/python3.6/site-packages (python 3.6)
$ pip install javapackages
Requirement already satisfied: javapackages in [...]/python2.7/site-packages

那是为什么

1）它完全是从站点包读取的吗？对于the documentation，确定是否应可访问的标志为False。

2）它是从旧版Python的站点包中读取的吗？